Emoey stockwell



(ModeL) v E. STOCKWELL.

Dial for Permutation Look. No. 240,783. Patented-April26,1881

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NVPETERS. PHQTVUTHOOKAPHER, WASHINGTON, D, C-

UNITED STATES PATENT OFFICE.

EMORY STOCKWELL, OF STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE- LOCK MANUFACTURING COMPANY, OF SAME PLACE.

DIAL FOR PERM UTATION-LOCKS.

SPECIFICATION forming part of Letters Patent No. 240,783, dated. April 26, 1881.

Application filed March 16, 1881., (ModeL) To all whom it may concern.- An important advantage incident to my im- Be it known that I, EMORY STooKWELL, of provement is that it answers the purpose of a Stamford, in the county of Fairfield and State separate key-lock for a safe-door that is also of Connecticut, have invented certain new and provided with a secure combination-lock, so useful Improvements in Dials for Combination that in the ordinary course of business during 5 5 Locks, of which the following is a specification, the day when a banker has occasion to close reference being bad to the accompanyingdrawand fasten his safe-door at frequent intervals ings, in which- 1 he is enabled to do so without working his com- Figure 1 is a front elevation, partly in secbination-lock and without the ordinary extra 0 tion, of an ordinary combination-lock dial and key-lock. By employing my supplemental dialring with my improvements applied. Fig. 2 look he is enabled to throw the bolts of the is a detailed view of a detached section. Fig. safe-door and check them with the bolt of the 3 is a perpendicular central section through combination-lock without rotatingthe am far the line 3 3 of Fig. 2. Fig. 4 is aview showenough to disturb the combination, and then 1 ing the parts in section on line 4. 4 of Fig. 2, to secure his door by locking the dial with my and Fig. 5 shows a section of a key. supplemental dial-lock, so that the dial cannot Combination or dial looks, as commonly conbe rotated to retract the combination-lock bolt, structed, for safes, vaults, 850., have this deand thus the door-bolts are efficiently checked. feet, that when standing unlocked, as they The proprietor or proper officer by using his 2o usually do during the day-time when safe-doors dial-lock key can instantly release the tempo- 7b are open, any one expert with respect to such rary fastening, andis thus able to quickly open locks can easily pick up the combination of the safe, and as quickly close and secure it their tumblers by manipulating the dial. This again. fact is a constant source of danger to users of Proceeding now to a description in detail of 2 5 such locks, since it enables any one who may my invention by reference to the letters upon obtain access to them during the day to feel the accompanying drawings, A indicates a out the combination, and thus possess himself dial-ring ofordinary form; and B a graduated of its secret for illegitimate use. 'To guard combination-dial rotatingwithin the ring, as against this danger various devices have been shown, by means of a knob, C, for operating a 0 resorted to, one of which is the entire covering combination-lock spindle. I pivot two or more over of the dial by a box or lid attached to the tumblers, D, upon a hollow post, E, of the dialdoor of the safe or vault. ring, and provide them with a spring, F, which The main object of my improvement is to tends to keep their notches Gout of alignment protect the lock from this danger, and accordwith the gate H, carried by the curved spring 35 in glyIprovide a small supplemental lock with- I, which is secured, as shown, along the inner 8 5 in the dial-ring to secure the dial from turning, face of the dial-ring. To the back of the dialand thus I effectually prevent surreptitious ring I secure a small segmental plate, K, from discovery of the secret of the combination upon which projects the key-post L. In the face of which the lock is set; but the utility of myinthe dial-rin g I cut a key hole, M, suitable to 40 vention extends still farther. It is well known receive a key, N, adapted to oscillate the tumbthat it is somewhatinconvenient and consumes lers, so that their notches will be in alignment some time to lock and unlock a safe-door with with the gate H, and also adapted to press a good combination-lock which affords a high the gate H into the tumbler-notches. I form degree of security. Consequently it is usual, a small recess, 0, in the rim of the dial, suit- 5 as remarked above, for bankers to leave their able to admit the outside edge of the gate H.

safe-doors open during the business hours of From this construction it will be perceived the day, or else sometimes to apply separate that the gate H, tends by force of the spring key-locks to them to temporarily secure them, I to bear outward, so as to enter the recess 0, and to avoid placing too strong temptation bein the rim of the dial, and thus lock the dial 5o fore clerks and employs. and prevent it from turning. The insertion 10o and operation of the key will force the gate H into the tumbler-notches and unlock the dial, when it may be turned at pleasure while the key remains in the lock. When the key is turned back and removed, however, the lock .will, so far as the action of this mechanism is concerned, always be locked, provided the recess O is opposite the gate, or when it comes opposite the gate by turning it; but as it is not always desirable to have the dial locked in place, or liable to become locked in place upon the removal of the key, I provide a pivoted stop, P, which projects through a slot, Q,

in the diaLrin g to the outside of the ring, as

shown in Fig. 1. This stop, when turned in the direction of the arrow, bears against the spring 1 and prevents its throwing the gate out of the tumblernotches and locking the dial,

. and when turned in the opposite direction, it

is simply placed out of action, and permits the spring to cast the gate into the locked position. By means of this stop P the lock can be set so as to be inoperative when desired, and-also so that by tripping the stop with the finger the lock will be brought into operation. The result is that the user can unlock the dial and set the stop I? and withdraw his key, and and then rotate the dial as many times as necessary, and then trip the stop P with his finger, and so fasten the dial. It also enables him at pleasure to set the lock in the inoperative condition, leaving the dial free to be used in the ordinary manner.

What I claim as new, and desire to secure by Letters Patent, is

1. The combination of a combination-lock dial and ring with a lock applied to the dialring so as to secure the dial fixedly in the ring to prevent its rotation, substantially as and for the purpose described. 

